package com.xhdp.handle;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.xhdp.dto.UserDTO;
import com.xhdp.utils.RedisConstants;
import com.xhdp.utils.UserHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * token刷新拦截器
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取请求头中的token
        String token = request.getHeader("Authorization");
        if (StrUtil.isEmpty(token)) {
            return true;
        }
        //获取redis中的用户
        String tokenKey = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(tokenKey);
        //判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }
        //将查询到的Hash数据转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        //保存用户到ThreadLocal
        UserHolder.saveUser(userDTO);
        //刷新token有效期
        stringRedisTemplate.expire(tokenKey, RedisConstants.LOGIN_USER_TTL, TimeUnit.SECONDS);
        //放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
